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authorPaul Burton <paul.burton@imgtec.com>2017-08-12 19:49:38 -0700
committerRalf Baechle <ralf@linux-mips.org>2017-08-30 00:57:27 +0200
commit5616897efd1816c18231c9976a6d64392fc6cdee (patch)
tree6b9f89b76cd24cddab10ccc7c8ea5ad79065ccb6 /arch/mips
parentfe7a38c625a2ee375870567c9fc8302e51e550f7 (diff)
downloadlinux-5616897efd1816c18231c9976a6d64392fc6cdee.tar.bz2
MIPS: Add CPU cluster number accessors
Introduce cpu_cluster() & cpu_set_cluster() accessor functions in the same vein as cpu_core(), cpu_vpe_id() & their set variants. These will be used in further patches to allow users to get or set a CPUs cluster number. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/17012/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/include/asm/cpu-info.h11
-rw-r--r--arch/mips/kernel/cpu-probe.c10
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h
index 0c61bdc82a53..a41059d47d31 100644
--- a/arch/mips/include/asm/cpu-info.h
+++ b/arch/mips/include/asm/cpu-info.h
@@ -139,6 +139,16 @@ struct proc_cpuinfo_notifier_args {
unsigned long n;
};
+static inline unsigned int cpu_cluster(struct cpuinfo_mips *cpuinfo)
+{
+ /* Optimisation for systems where multiple clusters aren't used */
+ if (!IS_ENABLED(CONFIG_CPU_MIPSR6))
+ return 0;
+
+ return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CLUSTER) >>
+ MIPS_GLOBALNUMBER_CLUSTER_SHF;
+}
+
static inline unsigned int cpu_core(struct cpuinfo_mips *cpuinfo)
{
return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CORE) >>
@@ -155,6 +165,7 @@ static inline unsigned int cpu_vpe_id(struct cpuinfo_mips *cpuinfo)
MIPS_GLOBALNUMBER_VP_SHF;
}
+extern void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster);
extern void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core);
extern void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe);
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 32aabd238737..cf3fd549e16d 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -2099,6 +2099,16 @@ void cpu_report(void)
pr_info("MSA revision is: %08x\n", c->msa_id);
}
+void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster)
+{
+ /* Ensure the core number fits in the field */
+ WARN_ON(cluster > (MIPS_GLOBALNUMBER_CLUSTER >>
+ MIPS_GLOBALNUMBER_CLUSTER_SHF));
+
+ cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_CLUSTER;
+ cpuinfo->globalnumber |= cluster << MIPS_GLOBALNUMBER_CLUSTER_SHF;
+}
+
void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core)
{
/* Ensure the core number fits in the field */